Making Textured Surface Emit Light
So what have you tried so far? Have you tried to duplicate your object, give the copy a higher Emission Strength and make it invisible to the camera?


Create a copy of your object and duplicate its material.
Scale the copy or move it above the original object.
Go in the Properties panel > Object > Display and choose Maximum Draw Type > Wire to make it easier to manipulate in Object mode. 
Go in the Properties panel > Object > Cycle Settings and deactivate the Camera option to make your object invisible in Render mode. 
Give this copy a higher Emission Strength so that it emits more light than the original and can enlight its environment.